<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="addRolesDialogVisible = true"
            >添加角色</el-button
          >
        </el-col>
      </el-row>

      <!-- 角色列表区域 -->
      <el-table border stripe :data="rolesList">
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row
              :class="['margin', 'bdbottom', i1 === 0 ? 'bdtop' : '']"
              v-for="(item1, i1) in scope.row.children"
              :key="item1.id"
              type="flex"
              align="middle"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{
                  item1.authName
                }}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过 for 循环 嵌套渲染二级权限 -->
                <el-row
                  :class="[i2 !== 0 ? 'bdtop' : '']"
                  v-for="(item2, i2) in item1.children"
                  :key="item2.id"
                  type="flex"
                  align="middle"
                >
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      closable
                      @close="removeRightById(scope.row, item2.id)"
                      >{{ item2.authName }}</el-tag
                    >
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag
                      type="warning"
                      v-for="item3 in item2.children"
                      :key="item3.id"
                      closable
                      @close="removeRightById(scope.row, item3.id)"
                    >
                      {{ item3.authName }}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column prop="roleName" label="角色名称"></el-table-column>
        <el-table-column prop="roleDesc" label="角色描述"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <!-- 编辑按钮 -->
            <el-button
              type="primary"
              icon="el-icon-edit"
              @click="showEditDialog(scope.row.id)"
              round
              size="mini"
              >编辑</el-button
            >
            <!-- 删除按钮 -->
            <el-button
              type="danger"
              icon="el-icon-delete"
              round
              size="mini"
              @click="removeRoleBuId(scope.row.id)"
              >删除</el-button
            >
            <el-button
              type="warning"
              icon="el-icon-setting"
              round
              size="mini"
              @click="showSetRightDialog(scope.row)"
              >分配权限</el-button
            >
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 添加角色对话框 -->
    <el-dialog
      title="添加角色"
      :visible.sync="addRolesDialogVisible"
      width="50%"
      @close="addRolesDialogClosed"
    >
      <el-form
        :model="rolesForm"
        :rules="rolesFormRules"
        ref="rolesFormRef"
        label-width="80px"
      >
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="rolesForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="rolesForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addRolesDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addRole">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改角色对话框 -->
    <el-dialog
      title="提示"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="80px"
      >
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="editForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="editForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editRoleInfo">确 定</el-button>
      </span>
    </el-dialog>

    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed"
    >
      <!-- 树形控件 -->
      <el-tree
        :data="rightsList"
        :props="treeProps"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defKeys"
        ref="treeRef"
      ></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有角色列表
      rolesList: [],
      // 控制添加角色提示框的显示和隐藏
      addRolesDialogVisible: false,
      // 添加角色表单对象
      rolesForm: {
        roleName: '',
        roleDesc: ''
      },
      // 添加角色表单规则对象
      rolesFormRules: {
        roleName: [
          { required: true, message: '请输入角色名称', trigger: 'blur' },
          { min: 2, max: 10, message: '长度在2~10个字符之间' }
        ],
        roleDesc: [{ required: true, message: '请输入角色描述', trigger: 'blur' }]
      },
      // 控制修改角色对话框的显示隐藏
      editDialogVisible: false,
      // 查询用户信息对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        roleName: [
          { required: true, message: '请输入角色名称', trigger: 'blur' },
          { min: 2, max: 10, message: '长度在2~10个字符之间' }
        ],
        roleDesc: [{ required: true, message: '请输入角色描述', trigger: 'blur' }]
      },
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 所有权限列表
      rightsList: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点 id 值数组
      defKeys: [],
      // 当前即将分配权限的角色 id
      roleId: ''
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    // 获取所有角色列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')

      if (res.meta.status !== 200) {
        // 显示获取角色列表失败
        return this.$message.error(res.meta.msg)
      }

      this.rolesList = res.data
    },
    // 监听添加角色提示框的关闭事件
    addRolesDialogClosed() {
      this.$refs.rolesFormRef.resetFields()
    },
    // 点击确定按钮添加新角色
    addRole() {
      this.$refs.rolesFormRef.validate(async valid => {
        if (!valid) return

        // 发起添加角色的网络请求
        const { data: res } = await this.$http.post('roles', this.rolesForm)

        if (res.meta.status !== 201) {
          return this.$message.error(res.meta.msg)
        }

        // 提示添加成功
        this.$message.success(res.meta.msg)
        // 隐藏添加角色的对话框
        this.addRolesDialogVisible = false
        // 重新获取角色列表数据
        this.getRolesList()
      })
    },
    // 根据 id 查询对应角色数据信息
    async showEditDialog(id) {
      // 显示修改角色对话框
      this.editDialogVisible = true
      // 通过 id 发起网络请求
      const { data: res } = await this.$http.get('roles/' + id)

      if (res.meta.status !== 200) {
        // 提示查询失败
        return this.$message.error(res.meta.msg)
      }

      this.editForm = res.data
    },
    // 监听修改角色对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击确定提交修改角色信息
    editRoleInfo() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        // 发起修改角色信息网络请求
        const { data: res } = await this.$http.put('roles/' + this.editForm.roleId, {
          roleName: this.editForm.roleName,
          roleDesc: this.editForm.roleDesc
        })

        if (res.meta.status !== 200) {
          // 提示修改失败
          return this.$message.error(res.meta.msg)
        }

        // 提示修改成功
        this.$message.success(res.meta.msg)
        // 关闭对话框
        this.editDialogVisible = false
        // 重新获取用户列表数据
        this.getRolesList()
      })
    },
    // 根据 id 删除对应角色信息
    async removeRoleBuId(id) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该角色, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除')
      }

      // 发起删除角色信息的网络请求
      const { data: res } = await this.$http.delete('roles/' + id)

      if (res.meta.status !== 200) {
        // 提示删除失败
        return this.$message.error(res.meta.msg)
      }

      // 提示删除成功
      this.$message.success(res.meta.msg)
      // 重新获取用户列表数据
      this.getRolesList()
    },
    // 根据 id 删除对应的权限
    async removeRightById(role, rightId) {
      // 弹框提示是否要删除
      const confirmResult = await this.$confirm(
        '此操作将永久删除该权限, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除')
      }

      // 发起删除对应权限的网络请求
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)

      if (res.meta.status !== 200) {
        // 提示删除失败
        console.log(res)
        return this.$message.error(res.meta.msg)
      }

      // 提示删除成功
      this.$message.success(res.meta.msg)
      // this.getRolesList()
      // 重新赋值
      role.children = res.data
    },
    // 显示分配权限
    async showSetRightDialog(role) {
      this.roleId = role.id
      // 获取所有权限列表
      const { data: res } = await this.$http.get('rights/tree')

      if (res.meta.status !== 200) {
        // 提示获取失败
        return this.$message.error(res.meta.msg)
      }

      // 把获取到权限数据保存到 data 中
      this.rightsList = res.data

      // 递归获取三级节点的 id
      this.getLeafKeys(role, this.defKeys)

      // 显示对话框
      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取角色下所有三级权限的 id，并保存到数组中
    getLeafKeys(node, arr) {
      // 如果当前节点不包含 children 属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }

      node.children.forEach(item => this.getLeafKeys(item, arr))
    },
    // 监听分配权限对话框关闭事件
    setRightDialogClosed() {
      this.defKeys = []
    },
    // 点击确定按钮为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]

      const idStr = keys.join(',')

      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, {
        rids: idStr
      })

      if (res.meta.status !== 200) {
        // 提示更新失败
        return this.$message.error(res.meta.msg)
      }

      // 提示更新成功
      this.$message.success(res.meta.msg)
      // 重新获取数据
      this.getRolesList()
      // 关闭对话框
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}

.margin {
  margin: 0 48px;
}
</style>
